#include <G4PolarizedAnnihilationModel.hh>

Inheritance diagram for G4PolarizedAnnihilationModel:

Public Member Functions
	G4PolarizedAnnihilationModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="Polarized-Annihilation")

virtual	~G4PolarizedAnnihilationModel () override

virtual void	Initialise (const G4ParticleDefinition *, const G4DataVector &) override

virtual G4double	ComputeCrossSectionPerElectron (G4double kinEnergy) override

void	ComputeAsymmetriesPerElectron (G4double gammaEnergy, G4double &valueX, G4double &valueA, G4double &valueT)

virtual void	SampleSecondaries (std::vector< G4DynamicParticle * > , const G4MaterialCutsCouple , const G4DynamicParticle *, G4double tmin, G4double maxEnergy) final

void	SetTargetPolarization (const G4ThreeVector &pTarget)

void	SetBeamPolarization (const G4ThreeVector &pBeam)

const G4ThreeVector &	GetTargetPolarization () const

const G4ThreeVector &	GetBeamPolarization () const

const G4ThreeVector &	GetFinalGamma1Polarization () const

const G4ThreeVector &	GetFinalGamma2Polarization () const

G4PolarizedAnnihilationModel &	operator= (const G4PolarizedAnnihilationModel &right)=delete

	G4PolarizedAnnihilationModel (const G4PolarizedAnnihilationModel &)=delete

Public Member Functions inherited from G4eeToTwoGammaModel
	G4eeToTwoGammaModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="eplus2gg")

	~G4eeToTwoGammaModel () override

G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cutEnergy=0., G4double maxEnergy=DBL_MAX) override

G4double	CrossSectionPerVolume (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX) override

G4eeToTwoGammaModel &	operator= (const G4eeToTwoGammaModel &right)=delete

	G4eeToTwoGammaModel (const G4eeToTwoGammaModel &)=delete

Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)

virtual	~G4VEmModel ()

virtual void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel)

virtual void	InitialiseForMaterial (const G4ParticleDefinition , const G4Material )

virtual void	InitialiseForElement (const G4ParticleDefinition *, G4int Z)

virtual G4double	ComputeDEDXPerVolume (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=DBL_MAX)

virtual G4double	GetPartialCrossSection (const G4Material , G4int level, const G4ParticleDefinition , G4double kineticEnergy)

virtual G4double	ComputeCrossSectionPerShell (const G4ParticleDefinition *, G4int Z, G4int shellIdx, G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

virtual G4double	ChargeSquareRatio (const G4Track &)

virtual G4double	GetChargeSquareRatio (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual G4double	GetParticleCharge (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual void	StartTracking (G4Track *)

virtual void	CorrectionsAlongStep (const G4MaterialCutsCouple , const G4DynamicParticle , const G4double &length, G4double &eloss)

virtual G4double	Value (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy)

virtual G4double	MinPrimaryEnergy (const G4Material , const G4ParticleDefinition , G4double cut=0.0)

virtual G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple )

virtual void	SetupForMaterial (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual void	DefineForRegion (const G4Region *)

virtual void	FillNumberOfSecondaries (G4int &numberOfTriplets, G4int &numberOfRecoil)

virtual void	ModelDescription (std::ostream &outFile) const

void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)

std::vector< G4EmElementSelector * > *	GetElementSelectors ()

void	SetElementSelectors (std::vector< G4EmElementSelector * > *)

G4double	ComputeDEDX (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=DBL_MAX)

G4double	CrossSection (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

G4double	ComputeMeanFreePath (const G4ParticleDefinition , G4double kineticEnergy, const G4Material , G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition , const G4Element , G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectRandomAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectTargetAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double logKineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectRandomAtom (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	GetCurrentElement (const G4Material *mat=nullptr) const

G4int	SelectRandomAtomNumber (const G4Material *) const

const G4Isotope *	GetCurrentIsotope (const G4Element *elm=nullptr) const

G4int	SelectIsotopeNumber (const G4Element *) const

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=nullptr)

void	SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)

G4ElementData *	GetElementData ()

G4PhysicsTable *	GetCrossSectionTable ()

G4VEmFluctuationModel *	GetModelOfFluctuations ()

G4VEmAngularDistribution *	GetAngularDistribution ()

G4VEmModel *	GetTripletModel ()

void	SetTripletModel (G4VEmModel *)

void	SetAngularDistribution (G4VEmAngularDistribution *)

G4double	HighEnergyLimit () const

G4double	LowEnergyLimit () const

G4double	HighEnergyActivationLimit () const

G4double	LowEnergyActivationLimit () const

G4double	PolarAngleLimit () const

G4double	SecondaryThreshold () const

G4bool	DeexcitationFlag () const

G4bool	ForceBuildTableFlag () const

G4bool	UseAngularGeneratorFlag () const

void	SetAngularGeneratorFlag (G4bool)

void	SetHighEnergyLimit (G4double)

void	SetLowEnergyLimit (G4double)

void	SetActivationHighEnergyLimit (G4double)

void	SetActivationLowEnergyLimit (G4double)

G4bool	IsActive (G4double kinEnergy) const

void	SetPolarAngleLimit (G4double)

void	SetSecondaryThreshold (G4double)

void	SetDeexcitationFlag (G4bool val)

void	SetForceBuildTable (G4bool val)

void	SetFluctuationFlag (G4bool val)

G4bool	IsMaster () const

void	SetUseBaseMaterials (G4bool val)

G4bool	UseBaseMaterials () const

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

G4bool	IsLocked () const

void	SetLocked (G4bool)

void	SetLPMFlag (G4bool)

void	SetMasterThread (G4bool)

G4VEmModel &	operator= (const G4VEmModel &right)=delete

	G4VEmModel (const G4VEmModel &)=delete

Additional Inherited Members
Protected Member Functions inherited from G4VEmModel
G4ParticleChangeForLoss *	GetParticleChangeForLoss ()

G4ParticleChangeForGamma *	GetParticleChangeForGamma ()

virtual G4double	MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kineticEnergy)

const G4MaterialCutsCouple *	CurrentCouple () const

void	SetCurrentElement (const G4Element *)

Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData = nullptr

G4VParticleChange *	pParticleChange = nullptr

G4PhysicsTable *	xSectionTable = nullptr

const G4Material *	pBaseMaterial = nullptr

const std::vector< G4double > *	theDensityFactor = nullptr

const std::vector< G4int > *	theDensityIdx = nullptr

G4double	inveplus

G4double	pFactor = 1.0

std::size_t	currentCoupleIndex = 0

std::size_t	basedCoupleIndex = 0

G4bool	lossFlucFlag = true

Detailed Description

Definition at line 53 of file G4PolarizedAnnihilationModel.hh.

Constructor & Destructor Documentation

◆ G4PolarizedAnnihilationModel() [1/2]

G4PolarizedAnnihilationModel::G4PolarizedAnnihilationModel	(	const G4ParticleDefinition *	p = nullptr,
		const G4String &	nam = "Polarized-Annihilation" )

explicit

Definition at line 48 of file G4PolarizedAnnihilationModel.cc.

  : G4eeToTwoGammaModel(p, nam)
  , fCrossSectionCalculator(nullptr)
  , fParticleChange(nullptr)
  , fVerboseLevel(0)
{
  fCrossSectionCalculator  = new G4PolarizedAnnihilationXS();
  fBeamPolarization        = G4StokesVector::ZERO;
  fTargetPolarization      = G4StokesVector::ZERO;
  fFinalGamma1Polarization = G4StokesVector::ZERO;
  fFinalGamma2Polarization = G4StokesVector::ZERO;
}

Referenced by G4PolarizedAnnihilationModel(), and operator=().

◆ ~G4PolarizedAnnihilationModel()

G4PolarizedAnnihilationModel::~G4PolarizedAnnihilationModel ( )

overridevirtual

Definition at line 63 of file G4PolarizedAnnihilationModel.cc.

{
  delete fCrossSectionCalculator;
}

◆ G4PolarizedAnnihilationModel() [2/2]

G4PolarizedAnnihilationModel::G4PolarizedAnnihilationModel ( const G4PolarizedAnnihilationModel & )

delete

Member Function Documentation

◆ ComputeAsymmetriesPerElectron()

void G4PolarizedAnnihilationModel::ComputeAsymmetriesPerElectron	(	G4double	gammaEnergy,
		G4double &	valueX,
		G4double &	valueA,
		G4double &	valueT )

Definition at line 101 of file G4PolarizedAnnihilationModel.cc.

{
  // *** calculate asymmetries
  G4double gam = 1. + ene / electron_mass_c2;
  G4double xs0 = fCrossSectionCalculator->TotalXSection(
    0., 1., gam, G4StokesVector::ZERO, G4StokesVector::ZERO);
  G4double xsA = fCrossSectionCalculator->TotalXSection(
    0., 1., gam, G4StokesVector::P3, G4StokesVector::P3);
  G4double xsT1 = fCrossSectionCalculator->TotalXSection(
    0., 1., gam, G4StokesVector::P1, G4StokesVector::P1);
  G4double xsT2 = fCrossSectionCalculator->TotalXSection(
    0., 1., gam, G4StokesVector::P2, G4StokesVector::P2);
  G4double xsT = 0.5 * (xsT1 + xsT2);
 
  valueX = xs0;
  valueA = xsA / xs0 - 1.;
  valueT = xsT / xs0 - 1.;
 
  if((valueA < -1) || (1 < valueA))
  {
    G4ExceptionDescription ed;
    ed << " ERROR PolarizedAnnihilationPS::ComputeAsymmetries \n";
    ed << " something wrong in total cross section calculation (valueA)\n";
    ed << " LONG: " << valueX << "\t" << valueA << "\t" << valueT
       << "   energy = " << gam << G4endl;
    G4Exception("G4PolarizedAnnihilationModel::ComputeAsymmetriesPerElectron",
                "pol004", JustWarning, ed);
  }
  if((valueT < -1) || (1 < valueT))
  {
    G4ExceptionDescription ed;
    ed << " ERROR PolarizedAnnihilationPS::ComputeAsymmetries \n";
    ed << " something wrong in total cross section calculation (valueT)\n";
    ed << " TRAN: " << valueX << "\t" << valueA << "\t" << valueT
       << "   energy = " << gam << G4endl;
    G4Exception("G4PolarizedAnnihilationModel::ComputeAsymmetriesPerElectron",
                "pol005", JustWarning, ed);
  }
}

Referenced by ComputeCrossSectionPerElectron().

◆ ComputeCrossSectionPerElectron()

G4double G4PolarizedAnnihilationModel::ComputeCrossSectionPerElectron ( G4double kinEnergy )

overridevirtual

Reimplemented from G4eeToTwoGammaModel.

Definition at line 81 of file G4PolarizedAnnihilationModel.cc.

{
  // cross section from base model
  G4double xs = G4eeToTwoGammaModel::ComputeCrossSectionPerElectron(kinEnergy);
 
  G4double polzz = fBeamPolarization.z() * fTargetPolarization.z();
  G4double poltt = fBeamPolarization.x() * fTargetPolarization.x() +
                   fBeamPolarization.y() * fTargetPolarization.y();
  if(polzz != 0 || poltt != 0)
  {
    G4double xval, lasym, tasym;
    ComputeAsymmetriesPerElectron(kinEnergy, xval, lasym, tasym);
    xs *= (1. + polzz * lasym + poltt * tasym);
  }
 
  return xs;
}

◆ GetBeamPolarization()

const G4ThreeVector & G4PolarizedAnnihilationModel::GetBeamPolarization ( ) const

inline

Definition at line 118 of file G4PolarizedAnnihilationModel.hh.

{
  return fBeamPolarization;
}

◆ GetFinalGamma1Polarization()

const G4ThreeVector & G4PolarizedAnnihilationModel::GetFinalGamma1Polarization ( ) const

inline

Definition at line 124 of file G4PolarizedAnnihilationModel.hh.

{
  return fFinalGamma1Polarization;
}

◆ GetFinalGamma2Polarization()

const G4ThreeVector & G4PolarizedAnnihilationModel::GetFinalGamma2Polarization ( ) const

inline

Definition at line 129 of file G4PolarizedAnnihilationModel.hh.

{
  return fFinalGamma2Polarization;
}

◆ GetTargetPolarization()

const G4ThreeVector & G4PolarizedAnnihilationModel::GetTargetPolarization ( ) const

inline

Definition at line 114 of file G4PolarizedAnnihilationModel.hh.

{
  return fTargetPolarization;
}

◆ Initialise()

void G4PolarizedAnnihilationModel::Initialise	(	const G4ParticleDefinition *	part,
		const G4DataVector &	dv )

overridevirtual

Reimplemented from G4eeToTwoGammaModel.

Definition at line 69 of file G4PolarizedAnnihilationModel.cc.

{
  G4eeToTwoGammaModel::Initialise(part, dv);
  if(fParticleChange)
  {
    return;
  }
  fParticleChange = GetParticleChangeForGamma();
}

◆ operator=()

G4PolarizedAnnihilationModel & G4PolarizedAnnihilationModel::operator= ( const G4PolarizedAnnihilationModel & right )

delete

◆ SampleSecondaries()

void G4PolarizedAnnihilationModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	fvect,
		const G4MaterialCutsCouple *	,
		const G4DynamicParticle *	dp,
		G4double	tmin,
		G4double	maxEnergy )

finalvirtual

Reimplemented from G4eeToTwoGammaModel.

Definition at line 142 of file G4PolarizedAnnihilationModel.cc.

{
  const G4Track* aTrack = fParticleChange->GetCurrentTrack();
 
  // kill primary
  fParticleChange->SetProposedKineticEnergy(0.);
  fParticleChange->ProposeTrackStatus(fStopAndKill);
 
  // V.Ivanchenko add protection against zero kin energy
  G4double PositKinEnergy = dp->GetKineticEnergy();
 
  if(PositKinEnergy == 0.0)
  {
    G4double cosTeta = 2. * G4UniformRand() - 1.;
    G4double sinTeta = std::sqrt((1.0 - cosTeta) * (1.0 + cosTeta));
    G4double phi     = twopi * G4UniformRand();
    G4ThreeVector dir(sinTeta * std::cos(phi), sinTeta * std::sin(phi),
                      cosTeta);
    fvect->push_back(
      new G4DynamicParticle(G4Gamma::Gamma(), dir, electron_mass_c2));
    fvect->push_back(
      new G4DynamicParticle(G4Gamma::Gamma(), -dir, electron_mass_c2));
    return;
  }
 
  // *** obtain and save target and beam polarization ***
  G4PolarizationManager* polarizationManager =
    G4PolarizationManager::GetInstance();
 
  // obtain polarization of the beam
  fBeamPolarization = G4StokesVector(aTrack->GetPolarization());
 
  // obtain polarization of the media
  G4VPhysicalVolume* aPVolume    = aTrack->GetVolume();
  G4LogicalVolume* aLVolume      = aPVolume->GetLogicalVolume();
  const G4bool targetIsPolarized = polarizationManager->IsPolarized(aLVolume);
  fTargetPolarization = polarizationManager->GetVolumePolarization(aLVolume);
 
  if(fVerboseLevel >= 1)
  {
    G4cout << "G4PolarizedComptonModel::SampleSecondaries in "
           << aLVolume->GetName() << G4endl;
  }
 
  // transfer target electron polarization in frame of positron
  if(targetIsPolarized)
    fTargetPolarization.rotateUz(dp->GetMomentumDirection());
 
  G4ParticleMomentum PositDirection = dp->GetMomentumDirection();
 
  // polar asymmetry:
  G4double polarization = fBeamPolarization.p3() * fTargetPolarization.p3();
 
  G4double gamam1 = PositKinEnergy / electron_mass_c2;
  G4double gama = gamam1 + 1., gamap1 = gamam1 + 2.;
  G4double sqgrate = std::sqrt(gamam1 / gamap1) / 2.,
           sqg2m1  = std::sqrt(gamam1 * gamap1);
 
  // limits of the energy sampling
  G4double epsilmin = 0.5 - sqgrate, epsilmax = 0.5 + sqgrate;
  G4double epsilqot = epsilmax / epsilmin;
 
  // sample the energy rate of the created gammas
  // note: for polarized partices, the actual dicing strategy
  //       will depend on the energy, and the degree of polarization !!
  G4double epsil;
  G4double gmax = 1. + std::fabs(polarization);  // crude estimate
 
  fCrossSectionCalculator->Initialize(epsilmin, gama, 0., fBeamPolarization,
                                      fTargetPolarization);
  if(fCrossSectionCalculator->DiceEpsilon() < 0.)
  {
    G4ExceptionDescription ed;
    ed << "ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
       << "epsilmin DiceRoutine not appropriate ! "
       << fCrossSectionCalculator->DiceEpsilon() << G4endl;
    G4Exception("G4PolarizedAnnihilationModel::SampleSecondaries", "pol006",
                JustWarning, ed);
  }
 
  fCrossSectionCalculator->Initialize(epsilmax, gama, 0., fBeamPolarization,
                                      fTargetPolarization);
  if(fCrossSectionCalculator->DiceEpsilon() < 0)
  {
    G4ExceptionDescription ed;
    ed << "ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
       << "epsilmax DiceRoutine not appropriate ! "
       << fCrossSectionCalculator->DiceEpsilon() << G4endl;
    G4Exception("G4PolarizedAnnihilationModel::SampleSecondaries", "pol007",
                JustWarning, ed);
  }
 
  G4int ncount        = 0;
  G4double trejectmax = 0.;
  G4double treject;
 
  do
  {
    epsil = epsilmin * std::pow(epsilqot, G4UniformRand());
 
    fCrossSectionCalculator->Initialize(epsil, gama, 0., fBeamPolarization,
                                        fTargetPolarization, 1);
 
    treject = fCrossSectionCalculator->DiceEpsilon();
    treject *= epsil;
 
    if(treject > gmax || treject < 0.)
    {
      G4ExceptionDescription ed;
      ed << "ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
         << " eps (" << epsil
         << ") rejection does not work properly: " << treject << G4endl;
      G4Exception("G4PolarizedAnnihilationModel::SampleSecondaries", "pol008",
                  JustWarning, ed);
    }
    ++ncount;
    if(treject > trejectmax)
      trejectmax = treject;
    if(ncount > 1000)
    {
      G4ExceptionDescription ed;
      ed << "WARNING  in PolarizedAnnihilationPS::PostStepDoIt\n"
         << "eps dicing very inefficient =" << trejectmax / gmax << ", "
         << treject / gmax << ".  For secondary energy = " << epsil << "   "
         << ncount << G4endl;
      G4Exception("G4PolarizedAnnihilationModel::SampleSecondaries", "pol009",
                  JustWarning, ed);
      break;
    }
 
    // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
  } while(treject < gmax * G4UniformRand());
 
  // scattered Gamma angles. ( Z - axis along the parent positron)
  G4double cost = (epsil * gamap1 - 1.) / (epsil * sqg2m1);
  G4double sint = std::sqrt((1. + cost) * (1. - cost));
  G4double phi  = 0.;
  G4double beamTrans =
    std::sqrt(sqr(fBeamPolarization.p1()) + sqr(fBeamPolarization.p2()));
  G4double targetTrans =
    std::sqrt(sqr(fTargetPolarization.p1()) + sqr(fTargetPolarization.p2()));
 
  do
  {
    phi = twopi * G4UniformRand();
    fCrossSectionCalculator->Initialize(epsil, gama, 0., fBeamPolarization,
                                        fTargetPolarization, 2);
 
    G4double gdiced = fCrossSectionCalculator->getVar(0);
    gdiced += fCrossSectionCalculator->getVar(3) * fBeamPolarization.p3() *
              fTargetPolarization.p3();
    gdiced += 1. *
              (std::fabs(fCrossSectionCalculator->getVar(1)) +
               std::fabs(fCrossSectionCalculator->getVar(2))) *
              beamTrans * targetTrans;
    gdiced += 1. * std::fabs(fCrossSectionCalculator->getVar(4)) *
              (std::fabs(fBeamPolarization.p3()) * targetTrans +
               std::fabs(fTargetPolarization.p3()) * beamTrans);
 
    G4double gdist = fCrossSectionCalculator->getVar(0);
    gdist += fCrossSectionCalculator->getVar(3) * fBeamPolarization.p3() *
             fTargetPolarization.p3();
    gdist += fCrossSectionCalculator->getVar(1) *
             (std::cos(phi) * fBeamPolarization.p1() +
              std::sin(phi) * fBeamPolarization.p2()) *
             (std::cos(phi) * fTargetPolarization.p1() +
              std::sin(phi) * fTargetPolarization.p2());
    gdist += fCrossSectionCalculator->getVar(2) *
             (std::cos(phi) * fBeamPolarization.p2() -
              std::sin(phi) * fBeamPolarization.p1()) *
             (std::cos(phi) * fTargetPolarization.p2() -
              std::sin(phi) * fTargetPolarization.p1());
    gdist +=
      fCrossSectionCalculator->getVar(4) *
      (std::cos(phi) * fBeamPolarization.p3() * fTargetPolarization.p1() +
       std::cos(phi) * fBeamPolarization.p1() * fTargetPolarization.p3() +
       std::sin(phi) * fBeamPolarization.p3() * fTargetPolarization.p2() +
       std::sin(phi) * fBeamPolarization.p2() * fTargetPolarization.p3());
 
    treject = gdist / gdiced;
    if(treject > 1. + 1.e-10 || treject < 0)
    {
      G4ExceptionDescription ed;
      ed << "!!!ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
         << " phi rejection does not work properly: " << treject << G4endl;
      G4cout << " gdiced = " << gdiced << G4endl;
      G4cout << " gdist = " << gdist << G4endl;
      G4cout << " epsil = " << epsil << G4endl;
      G4Exception("G4PolarizedAnnihilationModel::SampleSecondaries", "pol009",
                  JustWarning, ed);
    }
 
    if(treject < 1.e-3)
    {
      G4ExceptionDescription ed;
      ed << "!!!ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
         << " phi rejection does not work properly: " << treject << "\n";
      G4cout << " gdiced=" << gdiced << "   gdist=" << gdist << "\n";
      G4cout << " epsil = " << epsil << G4endl;
      G4Exception("G4PolarizedAnnihilationModel::SampleSecondaries", "pol010",
                  JustWarning, ed);
    }
 
    // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
  } while(treject < G4UniformRand());
 
  G4double dirx = sint * std::cos(phi);
  G4double diry = sint * std::sin(phi);
  G4double dirz = cost;
 
  // kinematic of the created pair
  G4double TotalAvailableEnergy = PositKinEnergy + 2 * electron_mass_c2;
  G4double Phot1Energy          = epsil * TotalAvailableEnergy;
  G4double Phot2Energy          = (1. - epsil) * TotalAvailableEnergy;
 
  // *** prepare calculation of polarization transfer ***
  G4ThreeVector Phot1Direction(dirx, diry, dirz);
 
  // get interaction frame
  G4ThreeVector nInteractionFrame =
    G4PolarizationHelper::GetFrame(PositDirection, Phot1Direction);
 
  // define proper in-plane and out-of-plane component of initial spins
  fBeamPolarization.InvRotateAz(nInteractionFrame, PositDirection);
  fTargetPolarization.InvRotateAz(nInteractionFrame, PositDirection);
 
  // calculate spin transfere matrix
 
  fCrossSectionCalculator->Initialize(epsil, gama, phi, fBeamPolarization,
                                      fTargetPolarization, 2);
 
  Phot1Direction.rotateUz(PositDirection);
  // create G4DynamicParticle object for the particle1
  G4DynamicParticle* aParticle1 =
    new G4DynamicParticle(G4Gamma::Gamma(), Phot1Direction, Phot1Energy);
  fFinalGamma1Polarization = fCrossSectionCalculator->GetPol2();
  G4double n1              = fFinalGamma1Polarization.mag2();
  if(n1 > 1.)
  {
    G4ExceptionDescription ed;
    ed << "ERROR: PolarizedAnnihilation Polarization Vector at epsil = "
       << epsil << " is too large!!! \n"
       << "annihi pol1= " << fFinalGamma1Polarization << ", (" << n1 << ")\n";
    fFinalGamma1Polarization *= 1. / std::sqrt(n1);
    G4Exception("G4PolarizedAnnihilationModel::SampleSecondaries", "pol011",
                JustWarning, ed);
  }
 
  // define polarization of first final state photon
  fFinalGamma1Polarization.SetPhoton();
  fFinalGamma1Polarization.RotateAz(nInteractionFrame, Phot1Direction);
  aParticle1->SetPolarization(fFinalGamma1Polarization.p1(),
                              fFinalGamma1Polarization.p2(),
                              fFinalGamma1Polarization.p3());
 
  fvect->push_back(aParticle1);
 
  // **********************************************************************
 
  G4double Eratio = Phot1Energy / Phot2Energy;
  G4double PositP =
    std::sqrt(PositKinEnergy * (PositKinEnergy + 2. * electron_mass_c2));
  G4ThreeVector Phot2Direction(-dirx * Eratio, -diry * Eratio,
                               (PositP - dirz * Phot1Energy) / Phot2Energy);
  Phot2Direction.rotateUz(PositDirection);
  // create G4DynamicParticle object for the particle2
  G4DynamicParticle* aParticle2 =
    new G4DynamicParticle(G4Gamma::Gamma(), Phot2Direction, Phot2Energy);
 
  // define polarization of second final state photon
  fFinalGamma2Polarization = fCrossSectionCalculator->GetPol3();
  G4double n2              = fFinalGamma2Polarization.mag2();
  if(n2 > 1.)
  {
    G4ExceptionDescription ed;
    ed << "ERROR: PolarizedAnnihilation Polarization Vector at epsil = "
       << epsil << " is too large!!! \n";
    ed << "annihi pol2= " << fFinalGamma2Polarization << ", (" << n2 << ")\n";
 
    G4Exception("G4PolarizedAnnihilationModel::SampleSecondaries", "pol012",
                JustWarning, ed);
    fFinalGamma2Polarization *= 1. / std::sqrt(n2);
  }
  fFinalGamma2Polarization.SetPhoton();
  fFinalGamma2Polarization.RotateAz(nInteractionFrame, Phot2Direction);
  aParticle2->SetPolarization(fFinalGamma2Polarization.p1(),
                              fFinalGamma2Polarization.p2(),
                              fFinalGamma2Polarization.p3());
 
  fvect->push_back(aParticle2);
}

◆ SetBeamPolarization()

void G4PolarizedAnnihilationModel::SetBeamPolarization ( const G4ThreeVector & pBeam )

inline

Definition at line 108 of file G4PolarizedAnnihilationModel.hh.

{
  fBeamPolarization = G4StokesVector(pBeam);
}

◆ SetTargetPolarization()

void G4PolarizedAnnihilationModel::SetTargetPolarization ( const G4ThreeVector & pTarget )

inline

Definition at line 103 of file G4PolarizedAnnihilationModel.hh.

{
  fTargetPolarization = G4StokesVector(pTarget);
}

The documentation for this class was generated from the following files:

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4PolarizedAnnihilationModel() [1/2]

◆ ~G4PolarizedAnnihilationModel()

◆ G4PolarizedAnnihilationModel() [2/2]

Member Function Documentation

◆ ComputeAsymmetriesPerElectron()

◆ ComputeCrossSectionPerElectron()

◆ GetBeamPolarization()

◆ GetFinalGamma1Polarization()

◆ GetFinalGamma2Polarization()

◆ GetTargetPolarization()

◆ Initialise()

◆ operator=()

◆ SampleSecondaries()

◆ SetBeamPolarization()

◆ SetTargetPolarization()